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          <h1 class="post-title" itemprop="name headline">iOS Safiri如何播放网页中的视频</h1>
        

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        <p>众所周知，网页中的视频一般是基于flash的，而接触过iOS的人，应该都知道，iOS的safari是不支持的flash，至于iOS为何不支持flash，可以查考<a href="http://www.zhihu.com/question/19609079" target="_blank" rel="noopener">这里</a>. 那如何支持视频呢？对，就是html5的video，iOS safari已经支持了html5的video. 于是第三方视频网站要实现的就是提供带video的html，这样iOS设备才有办法播放.</p>
<h2 id="兼容iOS"><a href="#兼容iOS" class="headerlink" title="兼容iOS"></a>兼容iOS</h2><p>视频网站要兼容iOS设备，那必须知道客户端是否是iOS设备，这个可以通过user-agent来判断，于是在PC上的浏览器可以通过设置user-agent来模拟iOS浏览器. 既然可以识别出客户端，那接下来的工作就是根据客户端的不同，提供不同的html，对于iOS用户，提供带有video的html，而对于其他客户端，则保留原来的方式.</p>
<h2 id="HTML5的video标签"><a href="#HTML5的video标签" class="headerlink" title="HTML5的video标签"></a>HTML5的video标签</h2><p>HTML5可谓是下一代HTML，其在HTML的基础上增加了很多特性，其中支持多媒体就是其中之一，多媒体包括音频、视频等，接下来介绍下视频标签.</p>
<pre>
< video src="movie.ogg" controls="controls"> < /video>
</pre>
上述中是video标签的简单例子，其中src就指明了视频源.视频源可以是mp4、ts、m3u8等

## m3u8
也许很多人都不熟悉m3u8，当然也包括我，m3u8实际不是一个视频编码格式，而仅仅是一种播放多媒体列表的文件格式. m3u8是Unicode版本的m3u，用UTF-8编码。"M3U"和"M3U8"文件都是苹果公司使用的HTTP Live Streaming格式的基础，这种格式可以在iPhone和Macbook等设备播放。

m3u8文件是一个纯文本文件，可以指定多个多媒体的位置.

* \#EXTM3U - 文件的头部，必须是文件的第一行
* \#EXTINF - 指示多媒体文件的信息，包括播放时间和标题

下面来看下m3u8的文件DEMO:
<pre>
\#EXTM3U
\#EXT-X-TARGETDURATION:12
\#EXT-X-VERSION:2
\#EXTINF:6,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=0&ts_end=5.906&ts_seg_no=0&ts_keyframe=1
\#EXTINF:5,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=5.906&ts_end=10.661&ts_seg_no=1&ts_keyframe=1
\#EXTINF:6,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=10.661&ts_end=16.667&ts_seg_no=2&ts_keyframe=1
\#EXTINF:10,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=16.667&ts_end=27.136&ts_seg_no=3&ts_keyframe=1
\#EXTINF:9,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=27.136&ts_end=36.019&ts_seg_no=4&ts_keyframe=1
\#EXTINF:12,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=36.019&ts_end=47.823&ts_seg_no=5&ts_keyframe=1
\#EXTINF:10,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=47.823&ts_end=58.083&ts_seg_no=6&ts_keyframe=1
\#EXTINF:10,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=58.083&ts_end=67.843&ts_seg_no=7&ts_keyframe=1
\#EXTINF:8,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=67.843&ts_end=75.684&ts_seg_no=8&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=75.684&ts_end=86.862&ts_seg_no=9&ts_keyframe=1
\#EXTINF:8,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=86.862&ts_end=94.786&ts_seg_no=10&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=94.786&ts_end=105.672&ts_seg_no=11&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=105.672&ts_end=116.892&ts_seg_no=12&ts_keyframe=1
\#EXTINF:12,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=116.892&ts_end=128.529&ts_seg_no=13&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=128.529&ts_end=139.998&ts_seg_no=14&ts_keyframe=1
\#EXTINF:12,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=139.998&ts_end=151.552&ts_seg_no=15&ts_keyframe=1
\#EXTINF:8,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=151.552&ts_end=159.643&ts_seg_no=16&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=159.643&ts_end=171.071&ts_seg_no=17&ts_keyframe=1
\#EXTINF:12,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=171.071&ts_end=182.624&ts_seg_no=18&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=182.624&ts_end=193.802&ts_seg_no=19&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=193.802&ts_end=204.396&ts_seg_no=20&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=204.396&ts_end=215.324&ts_seg_no=21&ts_keyframe=1
\#EXTINF:12,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=215.324&ts_end=226.918&ts_seg_no=22&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=226.918&ts_end=237.888&ts_seg_no=23&ts_keyframe=1
\#EXTINF:12,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=237.888&ts_end=249.691&ts_seg_no=24&ts_keyframe=1
\#EXTINF:11,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=249.691&ts_end=260.327&ts_seg_no=25&ts_keyframe=1
\#EXTINF:9,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=260.327&ts_end=269.711&ts_seg_no=26&ts_keyframe=1
\#EXTINF:4,
http://121.12.89.21/6772086E552337397BF87488A/0300080100546C4E8E39C501DB0DC93150BCFB-DFBD-8638-4B96-9661586BFA43.mp4?ts_start=269.711&ts_end=273.34&ts_seg_no=27&ts_keyframe=1
\#EXT-X-ENDLIST

</pre>

<h2 id="综述"><a href="#综述" class="headerlink" title="综述"></a>综述</h2><p>于是，iOS设备播放在线视频原理是视频网站通过user-agent来适配并提供带video标签的html，video的src设置为视频列表文件源，即m3u8，iOS获取到相应的m3u8文件后，从而播放其中的视频链接.</p>

      
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